<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>div</title>

    <style type="text/css">
        #container {
            padding: 20px;
            border: 1px solid #000;
            background: red;
        }
    </style>
</head>
<body>

    <h1>title bar</h1>

    <div id="container">
        <p>这是我们的内容区域</p>
    </div>
</body>
</html>